Rockwell Automation 1752-L24BBBE SmartGuard 600 Controllers User Manual - Manual (Page 223)

Rockwell Automation Publication 1752-UM001E-EN-P - June 2014 223
Function Blocks Command Reference Appendix D
ESTOP Function Block Error Handling
A discrepancy error is generated when one of the inputs is not in it’s correct state
for longer than the Discrepancy Time. For example, in Dual Channel Equivalent
mode, both inputs must be active (on) within the Discrepancy Time or an error
occurs.
Use this table to diagnose and reset a discrepancy error condition in the ESTOP
function block.
ESTOP Function Block Timing Chart
The chart shows the I/O timing when the function block is set up as Dual
Channel Equivalent.
Light Curtain (LC) Function
Block Figure 51 - Light Curtain Function Block Diagram
Table 12 - Error Detection and Reset for ESTOP Function Block
Error
Condition
Status When an Error Occurs To Reset the Error Condition
Output Enable Fault
Present
Error Output
Discrepancy
Error OFF
(Safety State) ON Discrepancy
Error Output:
ON Remove the cause of the error and then
either:
1. Make the inputs active and inactive
again.
2. Change the controller’s operating
mode to Idle and back to Run.
Input 1 (NC)
Input 2 (NC)
Fault Present
Idle to Run
Output Enable
Discrepancy
Error
Discrepancy Time
!
!
Input 1 (NC) Output Enable
Input 2 (NC)
Input 1 (NC) Output Enable
Input 2 (NC)
Discrepancy Error
Fault Present
Default Connections Maximum I/O for Light Curtain Function